Server!=high performance, a server can be any device that's mostly on and connected to the network. None of the services you mention are "high performance", exc

Server!=high performance, a server can be any device that's mostly on and connected to the network. None of the services you mention are "high performance", except perhaps the firewall if you have a lot of traffic and a lot of rules. Also, don't host your own e-mail. Your server will go down, and you will lose mail, and it will be embarrassing.